Improvement in injectors for steam-engine boilers



`2 Sheetsf'`S]hee't`1., E. H. LITTLE.

lnjectorsfur Steam-Engine Boilers.

` N0156567L Patented Nov. 10,1874.

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G. H. LITTLE. Injectors for Steam-Engine Boilers.

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UNITED STATES PATENT GEORGE H. LITTLE, OF PEABODY, MASSACHUSETTS.

IMPROVEMENT IN INJECTORS FOR STEAM-ENGINE BOILERSV..f

Specification forming part of Letters Patent No. 156,67 l, dated November 10, 1874; application tiledv May 18, 1874.

To all whom it may concern:

Be it known that I, GEORGE H. LITTLE, of Peabody, in the county of Essex and State of Massachusetts, have invented certain Improvements in Injectors for Engine-Boilers; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention sufficient to enable those skilled in the art to practice it.

My improvements consist in devices having for their object the creating of a circulation to start the injector without wastin g water; the varying of the operative capacity of the steam or water without varying any tube or spindle to start the injector; the taking 'of water from the bottom of the boiler or in water-line, and returning it above water-line, to create a circulation for heating purposes; the taking of water at overow as well as at regular suction, or both simultaneously; the capability of reversin g the injector in applying it, so that either inlet may be used for steam or water.

In the drawing, Figure l illustrates an injector made in accordance with my invention. Fig. 2 is the same slightly modified; Fig. 3, details.

A is the body of the injector; B, the waterinlet tube and well or chamber; o, an adjustable steam-inlet tube; d, an adjustable outlettube suitable for leading to the boiler. ef are check-nuts for varying and adjusting the distance that these tubes shall project into the injector, in order to graduate, at will, their operative capacity, the adjustment of tube c determining the quantity of water that shall be taken up by the steam in its passage through the injector, and the adjustment ot' the tube d being for the purpose of creating a greater or less vacuum in the overflow-chamber d', to close up the check-valve g, and stop the water from coming into the chamber j, and also to enable the injector to start without wasting The check-valve g is arranged to be turned by the hand-wheel, as shown. 1 The water-inlet is provided with a self-acting l valve, h, and also with a permanent reservoir `or chamber, t', which, from its position and location, will remain always full, and the injector consequently primed, so that the water contained in it shall be ready for use the moment the injector is starteda most important advantage, as it is well known that in ordinary injectors the water that would be carried back to the wellwould escape from the tube beneath the overflow, and be wasted. The chamber j connects the overow or vacuum chamber d with the suction-pipe or well, and carries the water back to it, and keeps the ehamber supplied. The inner end of tube c is made tapering, and that portion of the passage k which this end enters is made conical, so that, when the tube o is adj usted forward, by means of the check-nut e, it shall lill more of the conical space la', and proportionately diminish the water supply or passage lc between them, while an adjustment backward enlarges this capacity and increases the supply. The adjustment iiiward or outward of the inner end of tube d, by means of the check-nut f, in a similar manner enlarges or diminishes the operative size of the vacuum-chamber d. The outlet-mouth l of the tube leading to the boiler is made largerthan its inlet-mouth.

The valve g may be left open, at' the option of the operator, after the injector is working from suction; but, if left open, it takes water from both places-wiz., the suction and the overflow-chamber.

Upon letting on the water, the steam-valve is all that is required to work the injector. Should the steam be low, it may, however, be necessary to close the water-valve to start it against pressure. y

The chamber n, instead ot' being tapered, as shown, may be straight, or of equal diameter throughout, the narrow passage k connecting abruptly therewith. The tube c in such case would not require a taper at its inner end. Its adjustment would give' the same results as heretofore described.

The injector can be used for throwing water in any place where hot water is required, for emptying or lling tanks; also, for heating water in steam-boilers, by taking it from the boiler, or in water-line, and returning it above water-line.

Figs. 2 and 3 show simply a modification, in which the tube corresponding to tube c in Fig. l is made with several smaller tapering exittubes, c o', Ste., instead of with a single exit: and the inlet-mouth of the passage 7c being, of

QFFILGE course, provided with corresponding conical passages c c, 825e.

The valve g, shown in Fig. 2, is a self-acting one, which may be used instead of the 011e turned by the wheel m, shown in Fig. l.

1 desired to work fora lower pressure, the valve (not shown) in the pipe which supplies B allows a regulation at will.

When the head of water is great the adjustmen't forward of tube c allows a sufficiency of water, and when the head is less the adjustment backward of tube c allows ample room to admit a sufficient supply. When the apparatus is so applied as to take water through o and steam through B, c is placed vertically,

and the space between B and A becomes the priming-chamber.

1. The combination, in an injector, of the tube d, made as described, the nut f, the tube 7c, and the overiiow-valve g, Fig. 2, the nut affording a means of adjustment, serving to create a vacuum sooner or later at will.

2. In combination with the injector, the annular water reservoir or chamber t', made in the top of the tube B, and placed iu the nearest practicable proximity to the tube c, substantially as and for the purposes set forth.

3. The combination, in an injector, of the priming-chamber i with the tube c and with the tube B, whereby the injector is adapteito .Y

be applied in use with either the tube c or the tube B as the steam-receiving tube, substantially as described and shown.

G. H. LITTLE. Witnesses:

M. W. FROTHINGHAM, S. B. KIDDER. 

